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Pkware encryption for Zip files didn't allow for multiple reads of an entry #144

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opened 2026-01-29 22:07:21 +00:00 by claunia · 0 comments
claunia commented 2026-01-29 22:07:21 +00:00
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Originally created by @alexmgerasimov on GitHub (Nov 18, 2016).

Hello!

I tried to use this library and faced some issues. Basically repeated reading of some zip archive entries leads to crashes. It seems that this is related to encrypted zips somehow. I'm using the following test code to reproduce the crashes:

	class Program
	{
		static void Main(string[] args)
		{
			try
			{
				using (var fileStream = File.Open(@"c:\Archive1.zip", FileMode.Open))
					UnpackMultipleTimes(fileStream, "12345678");
			}
			catch (Exception e)
			{				
			}
		}

		private static void UnpackMultipleTimes(Stream stream, string password)
		{
			using (var archive = ArchiveFactory.Open(stream, new ReaderOptions {Password = password}))
			{
				var entries = archive.Entries.Where(entry => !entry.IsDirectory);

				foreach (var entry in entries)
				{
					for (int i = 0; i < 100; i++)
					{
						using (var memoryStream = new MemoryStream())
						using (var entryStream = entry.OpenEntryStream())
						{
							entryStream.CopyTo(memoryStream);
						}
					}
				}
			}
		}
	}

Exception from Archive1.zip:

SharpCompress.Compressors.Deflate.ZlibException was unhandled
HResult=-2146233088
Message=Bad state (invalid block type)
Source=SharpCompress
StackTrace:
в SharpCompress.Compressors.Deflate.InflateManager.Inflate(FlushType flush)
в SharpCompress.Compressors.Deflate.ZlibBaseStream.Read(Byte[] buffer, Int32 offset, Int32 count)
в System.IO.Stream.InternalCopyTo(Stream destination, Int32 bufferSize)
в SevenZipTest.Program.UnpackMultipleTimes(Stream stream, String password)
в SevenZipTest.Program.Main(String[] args)
в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
в System.Threading.ThreadHelper.ThreadStart()

I have several other archives with confidential data and can't share them. They produce exceptions with another messages. For example:

SharpCompress.Compressors.Deflate.ZlibException was unhandled
HResult=-2146233088
Message=Bad state (invalid literal/length code)
Source=SharpCompress
StackTrace:
в SharpCompress.Compressors.Deflate.InflateManager.Inflate(FlushType flush)
в SharpCompress.Compressors.Deflate.ZlibBaseStream.Read(Byte[] buffer, Int32 offset, Int32 count)
в System.IO.Stream.InternalCopyTo(Stream destination, Int32 bufferSize)
в SevenZipTest.Program.UnpackMultipleTimes(Stream stream, String password)
в SevenZipTest.Program.Main(String[] args)
в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
в System.Threading.ThreadHelper.ThreadStart()

Can you fix this, please?

Originally created by @alexmgerasimov on GitHub (Nov 18, 2016). Hello! I tried to use this library and faced some issues. Basically repeated reading of some zip archive entries leads to crashes. It seems that this is related to encrypted zips somehow. I'm using the following test code to reproduce the crashes: ``` class Program { static void Main(string[] args) { try { using (var fileStream = File.Open(@"c:\Archive1.zip", FileMode.Open)) UnpackMultipleTimes(fileStream, "12345678"); } catch (Exception e) { } } private static void UnpackMultipleTimes(Stream stream, string password) { using (var archive = ArchiveFactory.Open(stream, new ReaderOptions {Password = password})) { var entries = archive.Entries.Where(entry => !entry.IsDirectory); foreach (var entry in entries) { for (int i = 0; i < 100; i++) { using (var memoryStream = new MemoryStream()) using (var entryStream = entry.OpenEntryStream()) { entryStream.CopyTo(memoryStream); } } } } } } ``` Exception from [Archive1.zip](https://github.com/adamhathcock/sharpcompress/files/600724/Archive1.zip): > SharpCompress.Compressors.Deflate.ZlibException was unhandled > HResult=-2146233088 > Message=Bad state (invalid block type) > Source=SharpCompress > StackTrace: > в SharpCompress.Compressors.Deflate.InflateManager.Inflate(FlushType flush) > в SharpCompress.Compressors.Deflate.ZlibBaseStream.Read(Byte[] buffer, Int32 offset, Int32 count) > в System.IO.Stream.InternalCopyTo(Stream destination, Int32 bufferSize) > в SevenZipTest.Program.UnpackMultipleTimes(Stream stream, String password) > в SevenZipTest.Program.Main(String[] args) > в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) > в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) > в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() > в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) > в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) > в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) > в System.Threading.ThreadHelper.ThreadStart() > I have several other archives with confidential data and can't share them. They produce exceptions with another messages. For example: > SharpCompress.Compressors.Deflate.ZlibException was unhandled > HResult=-2146233088 > Message=Bad state (invalid literal/length code) > Source=SharpCompress > StackTrace: > в SharpCompress.Compressors.Deflate.InflateManager.Inflate(FlushType flush) > в SharpCompress.Compressors.Deflate.ZlibBaseStream.Read(Byte[] buffer, Int32 offset, Int32 count) > в System.IO.Stream.InternalCopyTo(Stream destination, Int32 bufferSize) > в SevenZipTest.Program.UnpackMultipleTimes(Stream stream, String password) > в SevenZipTest.Program.Main(String[] args) > в System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) > в System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) > в Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() > в System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) > в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) > в System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) > в System.Threading.ThreadHelper.ThreadStart() > Can you fix this, please?
claunia added the bug label 2026-01-29 22:07:21 +00:00
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Reference: starred/sharpcompress#144
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